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A. J. DONOVAN AND. F. POKORNY, In.

v GOVERNOR. APPLICATION FILED MA! I; 1920- Bbissued Nov. 21', 1922.

az u m mroma Twi Reissued Nov. 21, 1922.

UNITED STATES 1 Re. 15,492 PATENT OFFICE;

ARTHUR J. DONOVAN AND FRANK POKORNY, JR., OF NEW YORK, N. Y., ASSIGNORS, BY DIRECT AND MESNE ASSIGNMENTS, OF ONE-HALF TO SAID POKORNY, AND ONE- HALF 'I'O FRANCIS W. KEEGAN, BOTH OF NEW YORK, N. Y. 7

GOVERNOR.

. reissue filed May 1, 1920.

To all whom it may concern:

Be it known thatwe, ARTHUR J. DONOVAN and FRANK PoKoRNY, Jr., citizens of the in ependently controlled by separate vacuum chambers, and whereby an ample supply of fuel mixture is available under all conditions of overned intake requirements.

ther features and advantages of our said invention will hereinafter appear.

The drawing represents, enlarged, a vertical sectional view of the device.

In said view, 1 indicates the intake manifold ofa motor, and2 the carburetor, these elements being connected by an intermediate,

, cylindrical communicating device composed ofan upper portion 3, lower portion 4, and central portion Located centrally in the upper end of portion 3, is a depending cone 6, which is centered therein by radial supporting arms '7, carried by a ring 8. In a horizontal plane, below the cone 6, we provide a concentric member 9, having valve chambers 10,11, and slidable within member 9 is a hollow, gravity piston 12, having orifices 13 in its wall, and

a lower, radial flange 14; the periphery of said flange being slidable against the inner wall of central portion 5. Thus the outer surface, of piston 12, inner wall of portion 5, the flange 14, and the lower surface of memher 9, together constitute the confines of a chamber 15 which is contractible with the upward movement of piston 6, and expansible with the fall of said piston. Motor aspirating force, while drawing a fuel charge from the carburetor, through the hollow piston 12,-at the same time tends to exhaust chamber 15, through holes 13; and thus, by suction, lifts piston 12; whereby said piston January 7, 1919, Serial No. 229,909, filed April 22, 1918.

Application for Serial No. 378,254.

approaches the cone 6 and functions asan engine throttle.

The other piston element, which serves a supply throttle, consists .ofan annulus 16, having a radial flange 17 at its'lower portion, the periphery of said flange being slidable against the inner surface of portion 4, in the movement of said annulus, whose outer surface rides against theinner surface of a concentric member 18, in the functioning of said piston element. 2

Thus a chamber 19 isbound'ed by the an nulus 16, its flange 17, the portion '4 and the under surface of member 18 said chamber being contractible and expansible with the movement of said annulus. An orifice, as 20, through the annulus 16, permits exhaustion of the chamber19 under the aspiratory force of the motor, thus rendering said annulus responsive in v movement to that influence.

Normally the annulus 16 is seatedupon a base, as 21, which] may form part of a choke device, here shown as a ,Venturi tube 22, connected, as byradial arms 23, with a threaded'portion 24,"s crewed into portion 4. When the annulus is seated, as stated, the spaces between the arms 23 are thereby covered and fuel mixture can then only be drawn through the Venturi, flowing thus in restricted quantity, as for motor idling purposes; but when the annulus hasbeen lifted up, then additional fuel passage is available through the spaces between the arms 23, and

betweenjthe outer surface of Venturi tube and the under surface of the annulus 16, the extent and capacity of the passage varying according to the degree to which the an nulus-is raised,

The upward limited in extent by the lower surface of member 18, against which the flange 17 is arrested. At normal governed speed of the motor, operating under load, the tensional pull upon annulus 16, through chamber 19, in which a partial vacuum is created, as well as by the pressure that is exerted against the under, inclined surface 25 of said annulus, will tend to maintain the latter hovering midway in its range of movement, while providing a satisfying fuel supply.

It will be noted that the free piston or engine throttle device 12 has a longer range of travel thanthe supply throttle device 16,

travel of annulus 16 is r and that said devices functionindependently, of each other, though actuated by the same raising force, viz, the aspiratory tension of thegmotor. Vhen the member 12 approaches the limit of its upward, or engine throttling movement, its flange 14: meets the stem: 26 of avalve 27, located in chamber 10; and it also meets the stem 28 of a valve 29, located in chamber 11. The continued upward movement of member 12 causes the valve 27 to become unseated, thereby opening chamber 19 to the atmosphere, as through a gland 30 in 'member 1'8, an annular passage 31, and a gland 32 in portion 5, thusbreakingthepartial vacuum in chant ber 19,, whereby the annulus 16 is released from the motor tensional sustaining force,

, as applied thereto through thera refac'tion of chamber 19. this, time the motor will be throttled d'owmand the annulus 16, which falls to ts. sea-t by g a y, imits the passage of fuel atthe supply throttle, until the r v motor-throttle. opens up to enable the motor toagain speedup. But until the valve 27 is actuated in the manner described,cthe supply throttle 16,, in, normal governed opera 7 tion of the motor, will remain/suspended to permit, the flow of, a suitable fuel supply.

The flange 14: of engine, throttle 12, at about the'same time that it; actuates valve 27, also meets the, stem 28 ofvalve 29, seated in valve chambernll, opening said valve, andt'hereby placing vacuum chamber 15 in communication withtheatmosphere, through passage 33. The throttleor'piston '12 is then released from; the, tensional. support given it by-thevas'piratory force of the motor and may fall by. gravity. to the throttle full-open position, whereby the: motor is again enabled tov pick up speed, In the normal governed operation of the motor, however, the throttle member 12,. like the throttle mem= her "16, will. hover between, the respective clined surface limits-of its range of movement,

The effect. of providing. each throttle ele-Q,

ment with a separate vacuum'chamber." is to diminishthe weight ,to be supported by either, chamber, andfthu's to render the control more sensitive and readily responsive to'the'fiuctuations of motor'aspiratory tension.

VVhenthe vacuum chambers are opened to the atmosphere, then. the motor tension is relieved with; respect to the chambers 15 and 1 9, and the motor tension applies only to-the lower surfaces of the valves 12 and 1,6. .With the lift of supply .throttl'elii fuel mixture is caused to flow between the in.-

25, of said supply throttle and the; outer wall of the venturi, this fluid flow beingv accorded a convergent direction by the inward and upward angle of, said inclined surface 25, so that in fact the volumeof fl id ntersthe, passage. in. c lloidal form,

Sinceat the time fuel? mixture is also mately intermingled flowing, under the same'suction influence created by the engine in its asplratory operation, through the axial orifice of the mixture flow, which, has the effect ofinte nr sifying the force of impact between thetwo volumes of fluid, thereby [enhancing the value of the bombardment between the fluid streams i111 their fuel pulverizing andfmixe ture making characteristics. I Variations may be resorted to within the spirit and scope of our said invention and parts thereof used without others. We claim:v 1. In an internal combustion motor having a carburetor and a fuel passage, afreely movable gravity return throttle valve to control the supply offuel to said passage, a separate, freely movable gravity lretur'n throttle to controlthe admission of" fuel to the motor, said throttles adapted to be actuated by the aspiratory tension ofj the motor, and respective means for relieving the effect of the tensional pull of the motor as applied to said throttles. I f 2. 111 an internal combustion motor hauinga carbureter, the combination of a fuel passage, a- Venturi supply tube therefor, an auxiliary fuel passage surrounding said venturi, and a gravity returnthrottle valve normally closing said auxiliary passage, said valve adapted to be actuated by the (as; p r to yf enswn of th mo 3. InE an internal combustiolllmotorhaving acarbureteuthe combination of, av fuel passage, a gravity return throttlevalvev to control 11e eupp y passage, a;

gravity return, motorfthrettle lvalves adapted to be actuated; by the as, P11211591?tGIlSlOIl -OftllEz IHOlZOL 4 In an internal combustion motor hav ing acarbureter, the combinationof afuel passage, a gravity return throttle valve to control fuel supply to said passage' a'graw ity return motor throttle valve, said valves ARTHUR J DONOVANI FRANK. roKoRNY, 

